JP2007162892A - Centrifugal clutch for vibrative mold clamper - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent a problem of lining abrasion dust accumulating in a clutch drum by attaching a centrifugal clutch in a slanted state wherein an input shaft side is high and an output shaft side is low, since a body is in a forward tilted attitude in a vibration mold clamper such as a rammer. <P>SOLUTION: In a corner part 11 between a discoidal wall surface 10 and an annular circumference face 9 of the clutch drum 8, in the centrifugal clutch arranged in a slanted state such that the input shaft 3 side is high and the output shaft 4 side is low, outlets 12 for the lining abrasion powder are opened with intervals in between by cutting out one parts of the annular circumference face adjacent to the corner part 11. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a centrifugal clutch of a prime mover used in a vibration compactor such as a rammer, which strikes a road surface by vertical movement of a compaction plate and compacts the road surface and the like.

  Conventionally, in a vibration compaction machine such as a rammer, as shown in FIG. 4, the machine body A can automatically advance while the handle H is held by the operator during the road compaction operation. In order to do this, the machine body center line P is inclined at a predetermined angle with respect to the road surface C, and the machine body A is attached to the compression plate B so as to maintain a forward inclined posture. As a result, the input / output axis E of the prime mover D mounted on the machine body A is also inclined with respect to the horizontal line F so that the input shaft K is on the upper side and the output shaft L is on the lower side.

  By the way, in this kind of vibration compaction machine, it has been found that there is a phenomenon that the wear rate of the lining in the centrifugal clutch of the prime mover is abnormally higher than in the case of the centrifugal clutch used in other working machines.

  As a result of examining this cause, in the centrifugal clutch used in the rammer, as described above, the input / output axis E of the prime mover D is not parallel to the horizontal line F, the input shaft K is high, and the output shaft L is low. As shown in FIG. 5, the corner Q between the disk-shaped wall surface M and the annular peripheral surface N of the clutch drum G is the opening edge Na of the annular peripheral surface N. This is due to the fact that the wear powder that is inclined in a lower direction and peeled off from the surface of the lining R accumulates in the corners Q of the disk-shaped wall surface M and the annular peripheral surface N of the drum G. It has been found.

  In the centrifugal clutch, the lining R provided on the outer periphery of the shoe weight W is worn away from the surface of the lining R due to friction caused by the friction immediately before the inner periphery of the drum G comes into contact with the inner periphery of the drum G or before the separation. When the clutch is arranged so that the axis of the drum G is horizontal as in a normal use example, the wear powder scraped off from the lining R is externally moved along the annular peripheral surface N. Is not discharged into the drum G and does not accumulate in the drum G.

  However, as shown in FIG. 5, the corner Q between the disk-shaped wall surface M and the annular peripheral surface N of the clutch drum G is lower than the opening edge Na of the annular peripheral surface N due to the forward tilting posture of the airframe A. When inclined in the direction, the opening edge Na is positioned above the corner Q, so that the wear powder S peeled from the lining R is not discharged from the opening edge Na and enters the corner Q. Will be deposited.

  The wear powder S accumulated in the corner Q is not discharged from the upper opening edge Na, but always stays in the corner Q and does not easily flow out to the outside. A layer is formed by adhering to the inner peripheral surface, thereby reducing the volume in the clutch, obstructing air flow and causing the temperature to rise.

  Further, when the amount of wear powder accumulated in the corner Q increases, when the clutch drum G comes into contact with the peripheral surface of the lining R, a part of the wear powder that freely moves on the contact surface becomes part of the drum G and the lining. Since it is engaged between the drum G and the lining R, there is a clutch transmission loss in which the rotational force from the input shaft K cannot be effectively transmitted even if a frictional effect due to rotation occurs between the drum G and the lining R. There is a problem that the wear rate of the lining R is large as compared with the centrifugal clutch used for other working machines.

  Conventionally, in centrifugal clutches for work where power transmission is frequently interrupted, the temperature of the clutch often rises, so as a means to suppress the temperature, a housing surrounding the outside of the clutch or a clutch drum can be used. A technique is known in which a ventilation hole that causes air flow is provided, air is introduced into the clutch, and temperature rise is suppressed.

Utility Model Registration No. 3101343

  In the centrifugal clutch shown in Patent Document 1, since the input / output axis of the prime mover is parallel to the horizontal line, even if the abrasion powder peeled off from the lining spills into the drum, the abrasion powder moves along the inside of the annular peripheral surface. And discharged from the open end of the drum into the housing.

  Further, in this centrifugal clutch, an air circulation vent hole provided with a guide vane is provided on the disk-shaped wall surface of the drum, but this air hole is provided on the disk-shaped wall surface of the drum and has an annular circumference. Since it is not provided on the surface, the outside air can flow exclusively into the drum, but the lining wear powder that has spilled into the drum cannot be efficiently discharged out of the drum through the vents. , Has the problem of.

  In the present invention, in view of the problem as in the case of a centrifugal clutch in a vibration compactor such as a rammer, the centrifugal clutch provided in the working machine is inclined so that the input shaft K is high and the output shaft L is low. It is an object of the present invention to provide a centrifugal clutch that prevents lining wear powder from accumulating in the clutch drum of the output shaft when attached.

  As a specific means for constituting the centrifugal clutch, the present invention provides a power transmission unit of a vibration compactor for compacting a road surface by vertical movement of a compression plate, a clutch drum, an output shaft having a high input shaft side. It is a centrifugal clutch arranged in an inclined shape so that the side is lowered, and a return circumference adjacent to the corner of the disk-like wall surface of the clutch drum and the annular peripheral surface provided at the peripheral edge of the wall surface. It is characterized in that a plurality of lining wear powder discharge ports having a part of the surface cut out are opened at intervals.

  The lining dust discharge port extends from a part of the annular peripheral surface to a part of the disk-shaped wall surface at the corner of the disk-shaped wall surface of the clutch drum and the annular peripheral surface provided at the peripheral edge of the wall surface. The shape of the notch may be sufficient.

  In the centrifugal clutch according to the present invention, the angle between the disk-shaped wall surface and the annular peripheral surface of the clutch drum is formed in a V-shaped cross section by being inclined such that the output shaft side is low and the input shaft side is high. For this reason, when the abrasion powder is peeled off from the lining into the drum due to the contact between the lining and the drum, the abrasion powder collects at the corners of the disk-shaped wall surface and the annular peripheral surface in the clutch drum. Since a discharge port is provided at an interval, wear powder is discharged to the outside through the discharge port due to centrifugal force generated in the drum and vibration of the fuselage during operation of the fuselage.

  In addition, not only when the machine is in operation, but also when the drum stops rotating, such as when idling, the shoe weight with the lining on the outer peripheral surface rotates inside the drum, so the shoe weight rotates. Since the abrasion powder is discharged from the discharge port by the wind force accompanying the operation, a state in which the abrasion powder does not always exist in the drum is created.

  In this way, the wear powder in the drum is quickly discharged and the state where the wear powder does not always accumulate is maintained, so that the wear powder is bitten into the contact surface between the lining and the drum as in the past. The transmission loss of the clutch caused by the above is reduced, the temperature rise over the entire components of the clutch is eliminated, and the abnormal wear of the lining is greatly improved.

  As a discharge port for wear powder provided at the corners of the disk-shaped wall surface and the annular peripheral surface in the clutch drum, cut both wall surfaces from a part of the annular peripheral surface to a part of the disk-shaped wall surface at the corner. It is preferable that the shape is lacking.

  Next, the configuration of the centrifugal clutch according to the present invention will be described with reference to the embodiment shown in FIG. 1. This centrifugal clutch has a center line P aligned with a line F parallel to the ground as in the airframe 1 shown in FIG. 4. On the other hand, it is used on the upper part of a work machine such as a rammer that is inclined forward, and the input / output shaft side line 2 of the clutch provided on the upper part of the machine body 1 is higher on the clutch input shaft 3 side (the prime mover side). The output shaft 4 is attached so as to be inclined so as to be lowered.

  As shown in FIG. 2, a centrifugal clutch 5 having a plurality of shoe weights 6 each provided with a lining 7 is provided at the tip of the input shaft 3, and the centrifugal clutch 5 is connected to the output shaft 4. When the rotational speed from the prime mover is low in a state where the lining 7 is disposed in the clutch drum 8 provided at one end thereof, the centrifugal force for expanding the shoe weight 6 cannot be obtained. It does not come into contact with the inner peripheral surface of the surface 9, and therefore the prime mover is rotating, but the rotation is not transmitted to the clutch output shaft 4, and the output shaft 4 is stopped.

  On the other hand, a clutch drum 8 is provided at one end of the output shaft 4 for accommodating the centrifugal clutch 5 provided with the shoe weight 6 inside. When the rotational speed from the prime mover increases, the shoe weight in the drum 8 is increased. 6 is expanded by centrifugal force, and the lining 7 comes into contact with the inner peripheral surface of the annular peripheral surface 9 of the clutch drum 8, so that the rotation of the prime mover is transmitted to the clutch output shaft 4.

  As shown in FIG. 1, the clutch drum 8 provided at one end of the output shaft 4 includes a disk-shaped wall surface 10 and an annular peripheral surface 9 provided at the peripheral edge of the wall surface 10. A plurality of lining wear powder discharge ports 12 are formed at intervals in the corner portion 11 with the annular peripheral surface 9 by notching a part of the return peripheral surface 9 adjacent to the corner portion 11. .

  The lining wear powder discharge port 12 shown in FIG. 1 is formed by notching a part of the return peripheral surface 9 close to the corner portion 11 at the corner portion 11 of the disk-shaped wall surface 10 and the annular peripheral surface 9. As shown in FIGS. 2 and 3, the wear powder discharge port 12 is formed from a part of the annular peripheral surface 9 at the corner 11 between the disk-shaped wall surface 10 and the annular peripheral surface 9. It may have a shape cut out so as to cover both wall surfaces 9 and 10 over a part of the wall.

  The shape of the discharge port 12 is greater than that of a long groove shape in which the corner portion 11 of the disk-shaped wall surface 10 and the annular peripheral surface 9 is notched narrowly along the length direction of the input / output axis 2. 3, a shape like a hole having a wide opening along the circumferential direction of the annular peripheral surface 9 is preferable.

  As the lining 7 and the inner peripheral surface of the drum 8 come into contact with each other and the output shaft 4 side of the drum 8 rotates, the abrasion powder is peeled off from the lining 7 into the drum 8, but the lining 7 and the drum 8 are integrated. During high-speed rotation, the wear powder is discharged out of the drum so as to be ejected radially from the corner discharge port 12 of the drum 8 due to the centrifugal force generated in the drum and the vibration of the airframe.

  Further, since the rotational speed of the clutch input shaft 3 is low, the lining 7 and the drum 8 are not in contact with each other, and even when idling in which the rotation is not transmitted to the drum 8 on the output shaft 4 side, the shoe weight 6 on the input shaft 3 side. Is rotating in the drum 8, the wear powder is discharged from the discharge port 12 to the outside of the drum 8 due to the wind force accompanying the rotation of the shoe weight 6, and the state where the wear powder always accumulates in the drum 8 can be solved. it can.

  As shown in FIGS. 2 and 3, the shape of the discharge port 12 extends from a part of the annular peripheral surface 9 to a part of the disk-shaped wall 10 at the corner 11 of the disk-shaped wall 10 and the annular peripheral surface 9. A shape that extends over both wall surfaces 9 and 10 and opens like a wide hole along the circumferential direction of the annular peripheral surface 9 is preferable.

  In this centrifugal clutch, by opening a plurality of lining wear powder discharge ports 12 at the corners 11 of the disc-shaped wall surface 10 and the annular peripheral surface 9 of the clutch drum 8, the wear powder peeled off from the lining 7 is accurately discharged. As a result, it is possible to reduce clutch transmission loss due to biting of wear powder and to surely eliminate damage due to temperature rise and wear of the clutch, and it is possible to improve the practicality as a centrifugal clutch for this type of work equipment. .

Sectional drawing which shows the structure of the centrifugal clutch which concerns on this invention. Sectional drawing which shows the structure of the centrifugal clutch by another Example. The perspective view which shows the structure of the centrifugal clutch of FIG. A partially cutaway side view of a rammer equipped with a conventional centrifugal clutch. Sectional drawing which shows the structure of the conventional centrifugal clutch.

Explanation of symbols

1: Aircraft,
2: Input / output axis
3: Input shaft,
4: Output shaft,
5: Centrifugal clutch,
6: shoeweight,
7: Lining,
8: Clutch drum
9: Drum annular peripheral surface,
10: disk-shaped wall,
11: Corner,
12: Discharge port

Claims (2)

  A centrifugal clutch in which a clutch drum is disposed in a power transmission part of a vibration compactor for compacting a road surface by vertical movement of a compaction plate so as to be inclined such that the input shaft side is high and the output shaft side is low. A plurality of lining wear powder discharge ports are formed at the corners of the disk-shaped wall surface and the annular peripheral surface provided at the peripheral edge of the wall surface by cutting out a part of the return peripheral surface adjacent to the corner portion. Centrifugal clutch of vibration compactor opened at intervals.   A plurality of lining wear powder discharge ports, each of which is formed by cutting out a part of the disk-shaped wall surface and the annular peripheral surface, are provided at intervals between the disk-shaped wall surface of the clutch drum and the annular peripheral surface provided at the peripheral edge of the wall surface. The centrifugal clutch of the vibration compactor according to claim 1, which was established before.

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